. The elasmobranch fishes . Fig. 178. Arteries of the pectoral fin, Acanthias, dorsal view. (From Erik Miiller.) br., bracliial artery; , lateral pterygial ar- tery ; , median pterygial. INFEEIOE MESENTERIC ARTERY The inferior or posterior mesenteric artery {, figs. 173 and 174) usually arises as a single vessel, except occasionally as in Acanthias (see fig. 179), and is more or less removed from the anterior mesenteric. It supplies branches to the epigonal organ or non-functional part of the sex gland in forms in which such exists {Heierodontus, fig. 174, ep.; Triakis, and Mustelu

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. The elasmobranch fishes . Fig. 178. Arteries of the pectoral fin, Acanthias, dorsal view. (From Erik Miiller.) br., bracliial artery; , lateral pterygial ar- tery ; , median pterygial. INFEEIOE MESENTERIC ARTERY The inferior or posterior mesenteric artery {, figs. 173 and 174) usually arises as a single vessel, except occasionally as in Acanthias (see fig. 179), and is more or less removed from the anterior mesenteric. It supplies branches to the epigonal organ or non-functional part of the sex gland in forms in which such exists {Heierodontus, fig. 174, ep.; Triakis, and Mustelus antarcticus),

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